Baffle type exhaust silencer



March 27, 1951 J, WALLINGFORD 2,546,707

BAFFLE TYPE EXHAUST SILENCER Filed July 5, 1947 Inventor JOHN WALLINGFORD Attorney Patented Mar. 27, 1951 UNITED STATES" PATENT OFFICE This invention'relates to improvements in an exhaust silencer for internal combustion engines and appertains particularly to one in which a supplementary stream of fluid is blended with the motors exhaust.

An object of the invention is to provide a silencing device wherein the motor output of substantiall spaced or intermittent exhaust impulses are united with an added fluid stream as in a spiralling column to produce a continuous, f

even and uninterrupted flow.

A further object of the invention is to provide an exhaust silencer without setting up back pressure by combining a flow of fluid with the motors exhaust in such manner as to produce a smooth, steady and .as-nearly-as-possible vibrationless stream.

A still further object of the invention is the provision of a silencing apparatus for the exhaust of internal combustion engines of the nature described that is characterized by structural simplicity; operating efliciency and reasonable cost of production whereby the same is rendered commercially desirable.

To the accomplishment of these and related objects as shall become apparent as the description proceeds, the invention resides in the construction, combination and arrangement of parts as shall be hereinafter more fully described, illustrated in the accompanying drawings, and pointed out in the claims hereunto appended.

The invention will be best understood and can be more clearly described when reference is had to the drawings forming a part of this disclosure wherein like characters indicate like parts throughout the several views.

In the drawings:

Figure 1 is a vertical sectional elevation of a possible embodiment of the invention;

Figure 2 is a sectional elevation of a modified form of input for the silencer; and

Figure 3 is a sectional detail of the simplified outlet end of this modified form.

In this exhaust silencer the main jacket or housing 5 is shown in thread-coupled halves merely for the purpose of facilitating assembly. At the input end 6, that shall be designated the "upper end for convenient reference, the exhaust manifold tube l enters, continuin into the housing 5 and bending so that its mouth 8 is aligned with the housing axis. Here it lies within a concentric sleeve 9, having approximately twice the cross-sectional area of the tube 1, and provided with spiralling fins [0.

Beyond the delivery end of the sleeve 9 a series of staggered baflles H extend in from opposite sides of the housing 5 and in the lower end of the said housing, where it may be partially shielded by a final and perforated baffle plate 12, the outlet 54 occurs.

A Well or pocket !5 is provided in this lower or outlet end. of the housing and from an opening 16 therein, protected by a screen or filter I1, aduct l8 leadsto "a' motor drivin pump unit I9 that. feeds as. by the pipe 20, through a secondary inlet 2| in'the'upper or inlet end or the housing 5, to the spiralling or vortex sleeve 9.

In use, a body of suitable fluid, in either gaseous or liquid state, capable of relatively easy and rapid separation from the exhaust is driven by the pump I9 in a fast flowing stream through the finned sleeve 9 where it is spun into a vortex as it sucks in the exhaust entering through the mouth 8, smoothing out the spaced exhaust impulses into an even continuous spinning current. Billowing against the bafiles I I, the spinning is disturbed and interrupted and the exhaust gases and heavier stable driving fluid are completely separated so that on reaching the lower o outlet end of the housing, the former emerges in a quiet, gentle stream from the upper outlet l4 while the latter collecting in the well i5 is drawn back by the circulating pump l9 to the circuit line 20. Depending on the size or rating of the engine whose exhaust is being received, with respect to the flow of the motor driven fluid, the mouth 8 of the exhaust tube 1 may be restricted as at 22 to provide a venturi.

In the modification shown in Figure 2, an air inlet cone 25 feeds through the secondary inlet 2| in the upper end 6' of the housing 5 to the finned or vortex sleeve 9 in the same way as the motor driven fluid did in the pipe 20, just described. This type depends on a draft of air of sufficient velocity being fed through the cone 25 as by the movement of the vehicle or craft in which the motor is mounted. A simplified form of delivery end, as shown in Figure 3, is allowed where this is done; a single outlet 26 suflicing.

From the foregoing description taken in connection with the accompanying drawings, it will be manifest that an exhaust silencer for internal combustion engines is provided that will fulfill all the necessary requirements of such a device, but as many changes could be made in the above description and many apparently widely diflerent embodiments of the invention may be con structed within the scope of the appended claims, without departing from the spirit or scope there- 3 of, it is intended that all matters contained in the said accompanying specification and drawings shall be interpreted as illustrative and not in a limitative or restrictive sense.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent is:

1. A silencing apparatus for the exhaust of internal combustion engines comprising in combination with the engines exhaust pipe, a corn centric vortex-producing declining tube "surrounding the outlet of said exhaust pipe, v.a stream of fluid driven through said tube and combining with the engines exhaust therein-said vortex-producing tube beginning in advance of v and continuing far beyond the end of'said exhaust pipe and having approximatelyqtwicethe crosssectional area of said pipe, stream-bufieting, separating bafiles beyond said tube and separate outlets for the exhaustrgases and the driven fluid respectivelythe former being at the .top of the exhaust pipe extendedarshort distance into one end of said housing and terminating coaxial therewith, a concentric ,sleeve surrounding said the open end'of -said-:pipe, vortex-inducing'fins A exhaust-pipe and extending:ssubstantially. beyond on the inside of said sleeve beginning just in advance of and continuing well beyond the open delivering end of said exhaust pipe, outlets near the top and bottom respectively of the opposite end of said housing, a return conduit connecting the lower of said outlets with said sleeve and a secondary stream of fluid circulated therein.

3. The combination with the structure set forth in claim 2 wherein said exhaust pipe and said sleeve each enter said housing iin angular relation.

4. The combination with the structure set forth in claim 2 of flow-deflecting baffles in staggered position on the inside of said housing between the end of said sleeve and said outlets, said "baffles being inclined angularly in the direction of .fiowthrough-said housing and each deflecting towardrits successor.

JOHN WALLINGFORD.

REFERENCES CITED The following references are of ."record 'inthe file of'this patent:

UNITED STATES PATENTS 

